package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.constant.WxLoginConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    /**
     * @param dto
     * @return 微信登陆
     */
    @Override
    public User login(UserLoginDTO dto) {
//        调用微信服务接口，获取openId
        String openid = getOpenid(dto.getCode());


//        判断openID是否为空，为空登陆失败，抛出业务异常
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
//        判断用户是否为新用户
        User user = userMapper.getByOpenId(openid);

//        如果是新用户，自动完成注册
        if (user == null){
            user  = User.builder().openid(openid).createTime(LocalDateTime.now()).build();
            userMapper.insert(user);
        }
//        返回用户对象

            return user;
    }
    private String getOpenid(String code){
        Map<String, String> map = new HashMap<>();
        map.put(WxLoginConstant.appid, weChatProperties.getAppid());
        map.put(WxLoginConstant.secret, weChatProperties.getSecret());
        map.put(WxLoginConstant.js_code, code);
        map.put(WxLoginConstant.grant_type, WxLoginConstant.grant_type_value);
        String doGet = HttpClientUtil.doGet(WX_LOGIN, map);
        JSONObject jsonObject = JSON.parseObject(doGet);
        String openid = jsonObject.getString("openid");
        return openid;
    }

}
